+++ /dev/null
-/**
- * \file entropy.h
- *
- * \brief Entropy accumulator implementation
- *
- * Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
- * SPDX-License-Identifier: GPL-2.0
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * This file is part of mbed TLS (https://tls.mbed.org)
- */
-#ifndef MBEDTLS_ENTROPY_H
-#define MBEDTLS_ENTROPY_H
-
-#if !defined(MBEDTLS_CONFIG_FILE)
-#include "config.h"
-#else
-#include MBEDTLS_CONFIG_FILE
-#endif
-
-#include <stddef.h>
-
-#if defined(MBEDTLS_SHA512_C) && !defined(MBEDTLS_ENTROPY_FORCE_SHA256)
-#include "sha512.h"
-#define MBEDTLS_ENTROPY_SHA512_ACCUMULATOR
-#else
-#if defined(MBEDTLS_SHA256_C)
-#define MBEDTLS_ENTROPY_SHA256_ACCUMULATOR
-#include "sha256.h"
-#endif
-#endif
-
-#if defined(MBEDTLS_THREADING_C)
-#include "threading.h"
-#endif
-
-#if defined(MBEDTLS_HAVEGE_C)
-#include "havege.h"
-#endif
-
-#define MBEDTLS_ERR_ENTROPY_SOURCE_FAILED -0x003C /**< Critical entropy source failure. */
-#define MBEDTLS_ERR_ENTROPY_MAX_SOURCES -0x003E /**< No more sources can be added. */
-#define MBEDTLS_ERR_ENTROPY_NO_SOURCES_DEFINED -0x0040 /**< No sources have been added to poll. */
-#define MBEDTLS_ERR_ENTROPY_NO_STRONG_SOURCE -0x003D /**< No strong sources have been added to poll. */
-#define MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR -0x003F /**< Read/write error in file. */
-
-/**
- * \name SECTION: Module settings
- *
- * The configuration options you can set for this module are in this section.
- * Either change them in config.h or define them on the compiler command line.
- * \{
- */
-
-#if !defined(MBEDTLS_ENTROPY_MAX_SOURCES)
-#define MBEDTLS_ENTROPY_MAX_SOURCES 20 /**< Maximum number of sources supported */
-#endif
-
-#if !defined(MBEDTLS_ENTROPY_MAX_GATHER)
-#define MBEDTLS_ENTROPY_MAX_GATHER 128 /**< Maximum amount requested from entropy sources */
-#endif
-
-/* \} name SECTION: Module settings */
-
-#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
-#define MBEDTLS_ENTROPY_BLOCK_SIZE 64 /**< Block size of entropy accumulator (SHA-512) */
-#else
-#define MBEDTLS_ENTROPY_BLOCK_SIZE 32 /**< Block size of entropy accumulator (SHA-256) */
-#endif
-
-#define MBEDTLS_ENTROPY_MAX_SEED_SIZE 1024 /**< Maximum size of seed we read from seed file */
-#define MBEDTLS_ENTROPY_SOURCE_MANUAL MBEDTLS_ENTROPY_MAX_SOURCES
-
-#define MBEDTLS_ENTROPY_SOURCE_STRONG 1 /**< Entropy source is strong */
-#define MBEDTLS_ENTROPY_SOURCE_WEAK 0 /**< Entropy source is weak */
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/**
- * \brief Entropy poll callback pointer
- *
- * \param data Callback-specific data pointer
- * \param output Data to fill
- * \param len Maximum size to provide
- * \param olen The actual amount of bytes put into the buffer (Can be 0)
- *
- * \return 0 if no critical failures occurred,
- * MBEDTLS_ERR_ENTROPY_SOURCE_FAILED otherwise
- */
-typedef int (*mbedtls_entropy_f_source_ptr)(void *data, unsigned char *output, size_t len,
- size_t *olen);
-
-/**
- * \brief Entropy source state
- */
-typedef struct
-{
- mbedtls_entropy_f_source_ptr f_source; /**< The entropy source callback */
- void * p_source; /**< The callback data pointer */
- size_t size; /**< Amount received in bytes */
- size_t threshold; /**< Minimum bytes required before release */
- int strong; /**< Is the source strong? */
-}
-mbedtls_entropy_source_state;
-
-/**
- * \brief Entropy context structure
- */
-typedef struct
-{
-#if defined(MBEDTLS_ENTROPY_SHA512_ACCUMULATOR)
- mbedtls_sha512_context accumulator;
-#else
- mbedtls_sha256_context accumulator;
-#endif
- int source_count;
- mbedtls_entropy_source_state source[MBEDTLS_ENTROPY_MAX_SOURCES];
-#if defined(MBEDTLS_HAVEGE_C)
- mbedtls_havege_state havege_data;
-#endif
-#if defined(MBEDTLS_THREADING_C)
- mbedtls_threading_mutex_t mutex; /*!< mutex */
-#endif
-#if defined(MBEDTLS_ENTROPY_NV_SEED)
- int initial_entropy_run;
-#endif
-}
-mbedtls_entropy_context;
-
-/**
- * \brief Initialize the context
- *
- * \param ctx Entropy context to initialize
- */
-void mbedtls_entropy_init( mbedtls_entropy_context *ctx );
-
-/**
- * \brief Free the data in the context
- *
- * \param ctx Entropy context to free
- */
-void mbedtls_entropy_free( mbedtls_entropy_context *ctx );
-
-/**
- * \brief Adds an entropy source to poll
- * (Thread-safe if MBEDTLS_THREADING_C is enabled)
- *
- * \param ctx Entropy context
- * \param f_source Entropy function
- * \param p_source Function data
- * \param threshold Minimum required from source before entropy is released
- * ( with mbedtls_entropy_func() ) (in bytes)
- * \param strong MBEDTLS_ENTROPY_SOURCE_STRONG or
- * MBEDTSL_ENTROPY_SOURCE_WEAK.
- * At least one strong source needs to be added.
- * Weaker sources (such as the cycle counter) can be used as
- * a complement.
- *
- * \return 0 if successful or MBEDTLS_ERR_ENTROPY_MAX_SOURCES
- */
-int mbedtls_entropy_add_source( mbedtls_entropy_context *ctx,
- mbedtls_entropy_f_source_ptr f_source, void *p_source,
- size_t threshold, int strong );
-
-/**
- * \brief Trigger an extra gather poll for the accumulator
- * (Thread-safe if MBEDTLS_THREADING_C is enabled)
- *
- * \param ctx Entropy context
- *
- * \return 0 if successful, or MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
- */
-int mbedtls_entropy_gather( mbedtls_entropy_context *ctx );
-
-/**
- * \brief Retrieve entropy from the accumulator
- * (Maximum length: MBEDTLS_ENTROPY_BLOCK_SIZE)
- * (Thread-safe if MBEDTLS_THREADING_C is enabled)
- *
- * \param data Entropy context
- * \param output Buffer to fill
- * \param len Number of bytes desired, must be at most MBEDTLS_ENTROPY_BLOCK_SIZE
- *
- * \return 0 if successful, or MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
- */
-int mbedtls_entropy_func( void *data, unsigned char *output, size_t len );
-
-/**
- * \brief Add data to the accumulator manually
- * (Thread-safe if MBEDTLS_THREADING_C is enabled)
- *
- * \param ctx Entropy context
- * \param data Data to add
- * \param len Length of data
- *
- * \return 0 if successful
- */
-int mbedtls_entropy_update_manual( mbedtls_entropy_context *ctx,
- const unsigned char *data, size_t len );
-
-#if defined(MBEDTLS_ENTROPY_NV_SEED)
-/**
- * \brief Trigger an update of the seed file in NV by using the
- * current entropy pool.
- *
- * \param ctx Entropy context
- *
- * \return 0 if successful
- */
-int mbedtls_entropy_update_nv_seed( mbedtls_entropy_context *ctx );
-#endif /* MBEDTLS_ENTROPY_NV_SEED */
-
-#if defined(MBEDTLS_FS_IO)
-/**
- * \brief Write a seed file
- *
- * \param ctx Entropy context
- * \param path Name of the file
- *
- * \return 0 if successful,
- * MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR on file error, or
- * MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
- */
-int mbedtls_entropy_write_seed_file( mbedtls_entropy_context *ctx, const char *path );
-
-/**
- * \brief Read and update a seed file. Seed is added to this
- * instance. No more than MBEDTLS_ENTROPY_MAX_SEED_SIZE bytes are
- * read from the seed file. The rest is ignored.
- *
- * \param ctx Entropy context
- * \param path Name of the file
- *
- * \return 0 if successful,
- * MBEDTLS_ERR_ENTROPY_FILE_IO_ERROR on file error,
- * MBEDTLS_ERR_ENTROPY_SOURCE_FAILED
- */
-int mbedtls_entropy_update_seed_file( mbedtls_entropy_context *ctx, const char *path );
-#endif /* MBEDTLS_FS_IO */
-
-#if defined(MBEDTLS_SELF_TEST)
-/**
- * \brief Checkup routine
- *
- * This module self-test also calls the entropy self-test,
- * mbedtls_entropy_source_self_test();
- *
- * \return 0 if successful, or 1 if a test failed
- */
-int mbedtls_entropy_self_test( int verbose );
-
-#if defined(MBEDTLS_ENTROPY_HARDWARE_ALT)
-/**
- * \brief Checkup routine
- *
- * Verifies the integrity of the hardware entropy source
- * provided by the function 'mbedtls_hardware_poll()'.
- *
- * Note this is the only hardware entropy source that is known
- * at link time, and other entropy sources configured
- * dynamically at runtime by the function
- * mbedtls_entropy_add_source() will not be tested.
- *
- * \return 0 if successful, or 1 if a test failed
- */
-int mbedtls_entropy_source_self_test( int verbose );
-#endif /* MBEDTLS_ENTROPY_HARDWARE_ALT */
-#endif /* MBEDTLS_SELF_TEST */
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* entropy.h */
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